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/*
* Copyright (C) 2008, 2009 Nokia Corporation.
*
* Contact: Marius Vollmer <marius.vollmer@nokia.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* version 2.1 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*
*/
using GLib;
using Gee;
namespace ContextProvider {
internal class Subscriber : GLib.Object, DBusSubscriber {
Manager manager;
public DBus.ObjectPath object_path {get; set;}
// Keys subscribed to by this subscriber
public StringSet subscribed_keys {get; private set;}
public KeyUsageCounter key_counter {get; private set;}
HashTable<string, Value?> values_to_send;
bool idle_scheduled = false;
public Subscriber (Manager manager, KeyUsageCounter key_counter, int id) {
string path = "/org/freedesktop/ContextKit/Subscribers/%d".printf (id);
this.object_path = new DBus.ObjectPath (path);
this.manager = manager;
this.key_counter = key_counter;
subscribed_keys = new StringSet();
this.values_to_send = new HashTable<string, Value?>(str_hash, str_equal);
}
~Subscriber () {
debug ("Subscriber %s destroyed", object_path);
// TODO: Unsubscribe all the keys currently subscribed to
// Decrease the (global) subscriber count for the keys
key_counter.remove (subscribed_keys);
}
// Emit the Changed signal over DBus
public bool emit_changed () {
string[] unavail = {};
foreach (var i in values_to_send.get_keys()) {
if (values_to_send.lookup(i) == null) {
unavail += i;
values_to_send.remove(i);
}
}
Changed (values_to_send, unavail);
values_to_send.remove_all();
idle_scheduled = false;
return false;
}
public void Subscribe (string[] keys, out HashTable<string, Value?> values, out string[] undeterminable_keys) {
StringSet keyset = manager.check_keys(keys);
debug("Subscribe: requested valid keys %s", keyset.debug());
StringSet new_keys = new StringSet.difference (keyset, subscribed_keys);
debug("Subscribe: new keys %s", new_keys.debug());
key_counter.add (new_keys);
subscribed_keys = new StringSet.union(subscribed_keys, new_keys);
// Read the values from the central value table and return them
// Note: Use also those keys which were already subscribed to (and are subscribed to again)
manager.get_internal (keyset, out values, out undeterminable_keys);
}
public void Unsubscribe (string[] keys) {
StringSet keyset = manager.check_keys(keys);
StringSet decreasing_keys = new StringSet.intersection (keyset, subscribed_keys);
key_counter.remove (decreasing_keys);
subscribed_keys = new StringSet.difference (subscribed_keys, decreasing_keys);
}
/* Is called when the value of a property changes */
public void on_value_changed(string key, Value? value) {
if (subscribed_keys.is_member (key)) {
values_to_send.insert (key, value);
if (!idle_scheduled) {
Idle.add(this.emit_changed);
idle_scheduled = true;
}
}
}
}
}
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